Chloritisation of hornblende and biotite : a HRTEM study

• Autorzy: Ferrow E. , Bagiński B.
• Języki publikacji: EN

Abstrakty

EN

The coarse textures produced by hydration of hornblende and biotite during retrograde metamorphism of the rocks of the K?odzko-Z?oty Stok area were identified easily by both optical microscopy and scanning electron microscopy (SEM). However, the micro-textures that are a few unit cell in dimensions were identified through high resolution transmission electron microscopy (HRTEM) only. For the alteration of biotite to chlorite the replacement of potassium in the interlayer by a brucite-like layer and the subsequent increase in volume was observed. There were, however, some missing brucite-like layers within the chlorite units. Moreover, both topotactic and low angle replacement of biotite to chlorite were identified. For the direct hydration of hornblende to chlorite, HRTEM and selected area electron diffraction pattern (SAED) showed that the c* and a* of chlorite were parallel to the b* and a* of hornblende, respectively. Nevertheless, other orientation relationships were also observed by optical microscopy.

Słowa kluczowe

EN

biotite; chlorite; hornblende; intergrowth; metamorphic structures; microscopy

• Wydawca: Faculty of Geology of the University of Warsaw ; Komitet Nauk Geologicznych PAN
• Czasopismo: Acta Geologica Polonica
• Rocznik: 1998
• Tom: Vol. 48, no. 1
• Strony: 107--113
• Opis fizyczny: Bibliogr. 18 poz.

Twórcy

autor

Ferrow E.

autor

Bagiński B.

• Departament of Mineralogy and Petrology, Institute of Geology, Lund University, Solvegatan 13, S-223 62, Lund, Sweden